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No. 496,364. PatentedAplnZ, 1893.

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WINDOW SGREEN ATTAGHMENT.

10,496,364I Patented Apr; 25,1893-,

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UNITED STATES PATENT OFFICE.,

GEORGE YAKLE,

OF SAME PLACE.

WINDOW-SCREEN ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 496,364, dated April25, 1893. Application tiled May 7,1892. Serial No. 432,221. (No model.)

To all whom t may concern.-

Be it known that l, JOHN LAURIE, a citizen of the United States, and aresident of Baltimore city and State of Maryland, have invented certainnew and usefullmprovernents in Window-Screen Attachments,of which-thefollowing is a specification.

My invention consists of a device for attaching a screen or curtain to awindow or door or to the sides of a carriage, and has for its object tofurnish a screen or curtain which may be raised or lowered at will, and-When lowered may be clamped firmly on both sides throughout its wholelength, so as to hold it rmly in place, as securely as if nailed to asolid frame all round.

In the drawings Figure 1,is an elevation of a window showing my devicein place. Fig. 2, is a section of same. Fig. 3, is a perspective view ofthe upper end of the side bar of my device showing roller bracket andmethod of attaching the upper cross-bar of the'frame. Figs. 4, 5 and 6are detail views of locking device.

In the drawings, 1 is the window frame; 2 the sash.

3, 3, are the side bars of my frame which are securely attached to thesides of the win.- dow frame, and on the upper ends of which are mountedthe curtain brackets, 4, 4. These brackets as shown in the drawings areadapted for a spring roller, but any other kind of roller may beemployed which may be found suitable.

5, 5 are the clamp bars, they are strips of wood of about the samelength and size as the strips 3, 3, and to which they .are secured bymeans of the links 6, 6, so that as they move they will always remainparallel to the strips 3, 3, throughout their length, by this means theslot between these strips is always kept the same width andan equalpressure is maintained upon the edges of the screen or curtain.

7 is a light board preferably of the shape shown in Fig. 3, the ends ofwhich are inserted and held in the slots 13, 13 of the brackets 4, 4.These castings are made as shown in the drawings Fig. 3, for the purposeof facilitating the insertion and securing of the .board 7 in theposition shown, but any other location for the board, or method ofsecuring it which will accomplish the same object may be elnployed. Thepurpose of this board is to close the space between the top of theroller and the under side ot the top of the window frame. It will beobserved that the top of the slot 13 is open, thus permittinga board ofany Width to be inserted, to suit the height of the space to be filled.The screen will close all of the space below the roller,but if the spaceabove the roller be left unprovided for, iiies or mosquitos would havean open entrancel to the room above the roller. 14 is a bead on thelower end of the board 7, which protrudes forward and presses againstthe outside of the screen and completely closes the opening above theroller.

8 is the roller on which the screen or curtain is wound. I prefer aspring roller of the kind which will coil up the curtain by the force ofthe retractile spring contained within it.

9 is the curtain or screen. If the device is used for an ordinary blindany suitable material may be employed for this purpose. If for i'lyscreens a netting made of stronghemp or jute for the purpose isadmirably adapted. v

v11 is the cam clamp by which the bars 5, 5,

are moved and locked. When the clamp bar 5 is either raised or loweredso as to clamp the screen it is important that it should be locked inthe position in which it is placed. If opened in order that the slot maybe free and open for the curtain 0r screen to move, and if closed thatthe screen or curtain may be held firmly under all circumstances of windand weather. v

. 12 is a cam pivoted at 15 and having a lever or handle 16 projectingbeyond the pivot and by which the cam is operated. The cam is ellipticalin shape with the pivot located at about the focus farthest from theextremity of the cam.

17 is the cam seat constructed upon the dai gram shown in dotted linesin Fig. 4c from which it will be seen that the line A, A, which isparallel to the post 3, passes through one of the angles or points ofrestI in the cam and that the line B, B, which is perpendicular to thepost 3, 3, passes through another of the angles or points of rest in theseat. It will be observed that when the line B, B, passes through bothof the foci of the ellipse that the strips 3 and 5 will separate fromone another and the cam will be at rest in the angle below it. Vhen nowitis desired to close the clamp the lever 16 is moved down and as theextremity of the cam 12, bears upon the seat 17, the pivot will be moveddown also until the two foci of the ellipse are in a perpendicular line,or one parallel to the post 3, the extremity of the cam will then restin the second angle of the seat and when in that position will hold thestrip 5 firmly clamped and locked upon the strip 3.

Having now described my invention, what I claim, and desire to secure byLetters Patent, is-

1. In a window screen, the combination of an adjustable frame consistingof two sido bars provided on their upper ends with bearings for aroller, upon which is coiled a exible screen, a board 7 located behindthe roller and closing the space between the top of the window frame andthe top ot' the roller, a pair of clamps secured to the side bars andbetween which the sides of the screen pass and rest, and means forpressing the clamp upon the edges of the screen and side bars,substantially as described.

2. In a window screen, the combination of the sides ot a frame withstrips of wood or other suitable material resting upon them, a

screen or curtain suitably mounted and the edges of which rest betweenthe strips and the sides of the frame, and aclamping device consistingof a cam pivoted to the strip and bearing upon a curved seat secured tothe edge of the frame, the cam and seat being so constructed that whenthe cam is in one position and the clamp strip raised from the frame, aline drawn through the pivot of the cam and its point of contact withits seat Will be at right angles to the frame, while when the cam is inthe opposite position and bearing upon the upper side of the seat so asto clamp the strip firmly upon the edge of the frame, aline drawnthrough the pivot of the cam and its point of contact with its seat Willbe parallel to the edge of the frame.

3. In a Window screen, the combination of a roller suitably mounted inbearings and attached to a frame and to which is secured a exible screenor curtain, a pair of clamps located one at either side of the windowand each consisting of a pair of strips of wood or other suitablematerial one secured to the window frame and the other secured to thefirst by a series of links, so arranged that as the second strip ismoved up and down, it will move in a direction parallel to the firststrip throughout its length and approach or be withdrawn from the firststrip, while constantly maintaining its parallelism to it at all times,and means for locking the second strip upon the first one.

Signed at Baltimore city and State of Maryland this llth day ot' March,A. D. 1892.

JOHN LAURIE. Witnesses:

JNO. T. MADDoX, F. HARRY DEAN.

